CN104970858A - Fluid Ejection Device - Google Patents

Abstract

A fluid ejection device includes a fluid accommodation portion that has a fluid outlet connected to a fluid connection tube having a channel. A fluid pressing unit causes the fluid to flow out of the fluid outlet. A fluid ejection unit ejects in a pulsed manner fluid received from the fluid connection tube. A pressure detection unit detects pressure when the fluid pressing unit operates. A control unit causes the fluid pressing unit to operate in a state in which the channel is closed, and determines that the pressure detection unit has failed if the detected pressure when the fluid pressing unit comes into contact with the fluid accommodation portion is lower than a first determination value, or if the detected pressure when the fluid pressing unit does not come into contact with the fluid accommodation portion is equal to or higher than a second determination value.

Description

Fluid ejection apparatus

Technical field

The present invention relates to fluid ejection apparatus.

Background technology

Known technology of carrying out the incision or excision etc. of object with pulse type jet fluid.Such as, at medical field, as cutting or the surgical instrument of excision bio-tissue, propose a kind of fluid ejection apparatus, technique of above liquor ejecting device possesses and forms as lower part: with the pulsating flow generating unit of pulse type jet fluid; Fluid is supplied the fluid supply unit of pulsating flow generating unit; And the fluid delivery path (for example, referring to patent documentation 1) from fluid supply unit to pulsating flow generating unit.

At first technical literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2013-213422 publication

Summary of the invention

The technical problem that invention will solve

In this device, make the fluid in fluid delivery path maintain suitable pressure, and be very important with suitable intensity from pulsating flow generating unit jet fluid.For this reason, fluid ejection apparatus has the pressure transducer for the fluid pressure in test fluid feed path, but pressure transducer also likely breaks down.

If pressure transducer breaks down, then the fluid pressure in fluid delivery path can not be controlled at suitable pressure, therefore, likely can eject fluid with undesired intensity from pulsating flow generating unit.

Therefore, the technology of the fluid ejection apparatus needing a kind of fault for realizing detecting this pressure transducer, reliability high and safer.

For the scheme of technical solution problem

For the fluid ejection apparatus involved by one aspect of the present invention of solving the problems of the technologies described above, possess: fluid container, there is the fluid containment portion of containing fluid and be formed at the fluid issuing in described fluid containment portion; Fluid pressing portion, pushes described fluid containment portion, and described fluid is flowed out from described fluid issuing; Connecting pipings, one end is connected with described fluid issuing; Fluid jet portion, has the fluid taking mouth be connected with the other end of described connecting pipings, and the described fluid be taken into from described fluid taking mouth is sprayed with pulse type; Passage opening/closing portion, opens or closes the stream of the described fluid in described connecting pipings; Pressure detecting portion, detects pressure when described fluid pressing portion pushes described fluid containment portion, and exports the detection signal of the level corresponding with described pressure; And control part, under the state making described passage opening/closing portion close described stream, make described fluid pressing portion push described fluid containment portion, and described pressure when described fluid pressing portion contacts with described fluid containment portion represented by described detection signal lower than when the first decision content or, described pressure when described fluid pressing portion does not contact with described fluid containment portion represented by described detection signal be more than second decision content, judge that described pressure detecting portion breaks down.

For further feature of the present invention, will be become definitely by the record of this description and accompanying drawing.

Accompanying drawing explanation

Fig. 1 is the block diagram that the example formed according to the entirety of the fluid ejection apparatus of embodiment of the present invention is shown.

Fig. 2 is the block diagram that other examples formed according to the entirety of the fluid ejection apparatus of embodiment of the present invention are shown.

Fig. 3 is the block diagram of the formation of the pump illustrated according to embodiment of the present invention.

Fig. 4 is the block diagram of the formation of the pump illustrated according to embodiment of the present invention.

Fig. 5 is the sectional view of the structure of the pulsation generating unit illustrated according to embodiment of the present invention.

Fig. 6 is the top view of the form of the inlet fluid path illustrated according to embodiment of the present invention.

Fig. 7 is the block diagram of the formation of the pump control part illustrated according to embodiment of the present invention.

Fig. 8 is the figure of the passing of the level of the detection signal of the pressure transducer illustrated according to embodiment of the present invention and the output signal of touch sensor.

Fig. 9 is the flow chart of the handling process of the pump control part illustrated according to embodiment of the present invention.

Figure 10 is the figure of the passing of the level of the detection signal of the pressure transducer illustrated according to embodiment of the present invention and the output signal of touch sensor.

Figure 11 is the flow chart of the handling process of the pump control part illustrated according to embodiment of the present invention.

Figure 12 is the figure of the configuration example of the slide block illustrated according to embodiment of the present invention.

Symbol description

1 fluid ejection apparatus, 25 connection tubes, 26 three-way cocks, 100 pulsation generating units, 200 fluid jet pipes, 201 connect stream, 211 nozzles, 400 barrier films, 401 piezoelectric elements, 501 fluid chamber, 502 inlet fluid path pipes, 503 inlet fluid path, 510 outlet flow passage pipes, 511 outlet flow passage, 600 drive control parts, 625 pulsation generating unit starting switches, 630 control cables, 640 communication cables, 700 pumps, 710 pump control parts, 720 slide blocks, 722 pressure transducers, 723 touch sensors, 730 motors, 740 line slideways, 741 first limit sensors, 742 sensor for residual amount, 743 beginning level sensors, 744 second limit sensors, 750 pinch valves, 760 fluid containers, 761 syringes, 762 plungers, 763 pads, 764 peristomes, 765 fluid containment portions, 770 fluid container installation portions, 780 slide block release-pushes, 781 slide blocks arrange switch, 782 liquor charging ready switch, 783 fill switch, 785 pinch valve switches, 790 speakers

Detailed description of the invention

==summary==

By the record of this description and accompanying drawing, at least can clearly following item:

Specify that a kind of fluid ejection apparatus, it is characterized in that, possess: fluid container there is the fluid containment portion of containing fluid and be formed at the fluid issuing in described fluid containment portion; Fluid pressing portion, pushes described fluid containment portion, and described fluid is flowed out from described fluid issuing; Connecting pipings, one end is connected with described fluid issuing; Fluid jet portion, has the fluid taking mouth be connected with the other end of described connecting pipings, and the described fluid be taken into from described fluid taking mouth is sprayed with pulse type; Passage opening/closing portion, opens or closes the stream of the described fluid in described connecting pipings; Pressure detecting portion, detects pressure when described fluid pressing portion pushes described fluid containment portion, and exports the detection signal of the level corresponding with described pressure; And control part, under the state making described passage opening/closing portion close described stream, make described fluid pressing portion push described fluid containment portion, and described pressure when described fluid pressing portion contacts with described fluid containment portion represented by described detection signal lower than when the first decision content or, described pressure when described fluid pressing portion does not contact with described fluid containment portion represented by described detection signal be more than second decision content, judge that described pressure detecting portion breaks down.

According to this fluid ejection apparatus, can realize a kind of can the higher and safer fluid ejection apparatus of the fault of detected pressures test section, reliability.

Wherein preferred, described fluid pressing portion possesses: moving body, and the press direction in described fluid containment portion moves, to carry out the pushing to described fluid containment portion; And position detection part, detect the position of described moving body, the described pressure represented by the described detection signal exported by described pressure detecting portion when described first decision content is and is in based on described moving body the assigned position do not contacted with described fluid containment portion and the value determined.

According to this fluid ejection apparatus, even if deviate from normal pressure as the pressure of benchmark when carrying out the fault detect of pressure detecting portion, also can the fault of detected pressures test section.

And preferably, the value of described first decision content to be the described pressure represented by described detection signal that exported by described pressure detecting portion when being in described assigned position of described moving body with the error according to described pressure and the setting determined be added gained.

According to this fluid ejection apparatus, can the error of pressure release test section causes when the fault detect of pressure detecting portion impact.

And preferably, described fluid ejection apparatus also possesses: pressure detecting portion described in pressure detecting portion described in first and second, pressure detecting portion described in pressure detecting portion described in first and second in the described press direction of described moving body stacked be configured at when described moving body pushes described fluid containment portion by described moving body and described fluid containment portion the position that clamps, described control part adopt from pressure detecting portion described in first export first described in detection signal and from pressure detecting portion described in second export second described in any one signal detection signal or two signals control the described movement of described moving body, pressure when making described moving body push described fluid containment portion is the target pressure value of regulation, when described in judgement first, pressure detecting portion breaks down, described control part adopts detection signal described in second to continue described control, when described in judgement second, pressure detecting portion breaks down, described control part adopts detection signal described in first to continue described control.

According to this fluid ejection apparatus, even if the first pressure detecting portion or the second pressure detecting portion there occurs fault, fluid ejection apparatus also can carry out continuing the control from fluid jet portion jet fluid, thus can improve the reliability of fluid ejection apparatus.

And preferably, when judging that described pressure detecting portion breaks down, described control part makes described passage opening/closing portion open described stream.

According to this fluid ejection apparatus, even if suppose that the pressure in fluid containment portion becomes the above high pressure of anticipation, the pressure that also can reduce fluid containment portion by making the fluid in fluid containment portion flow out from fluid jet portion, thus the safety of fluid ejection apparatus can be improved.

And preferably, when judging that described pressure detecting portion breaks down, described control part exports the alarm representing that described pressure detecting portion breaks down.

According to this fluid ejection apparatus, promptly the situation that pressure detecting portion breaks down can be informed to the operators such as operation implementer, thus further can improve the safety of fluid ejection apparatus.

==overall formation==

Below, with reference to accompanying drawing, embodiments of the present invention are described.Fluid ejection apparatus according to the present embodiment may be used for the various situation such as cleaning or cut-out of fined object and works, bio-tissue etc., in embodiment described below, be described for the fluid ejection apparatus being suitable for the medical surgical knife cutting or excise bio-tissue.Therefore, the fluid used in fluid ejection apparatus is according to the present embodiment the medicinal liquid etc. of water, normal saline, regulation.In addition, for ease of diagram, hereafter illustrate that the accompanying drawing of institute reference is the scale of parts and the size in length and breadth partly schematic diagram different from actual size.

Fig. 1 is the formation key diagram of the fluid ejection apparatus 1 illustrated as operation scalpel according to the present embodiment.Fluid ejection apparatus 1 according to the present embodiment possesses: the pump 700 of delivering fluids, the fluid that pump 700 provides is converted to pulsating flow and the pulsation generating unit (fluid jet portion) 100 of spraying using pulse type and pump 700 are combined the drive control part 600 of the control carrying out fluid ejection apparatus 1 and to be connected between pump 700 and pulsation generating unit 100 also as the connection tube 25 of access path (connecting pipings) becoming the stream that fluid flows.

Further, details will be described later, and pulsation generating unit 100 possesses: hold the fluid chamber 501 of the fluid that pump 700 provides, the barrier film 400 changing the volume of this fluid chamber 501 and the piezoelectric element 401 that barrier film 400 is vibrated.

And pulsation generating unit 100 possesses: the nozzle 211 that the flow diameter of the fluid jet pipe 200 becoming the thin tube-like of the stream of the fluid spued from fluid chamber 501 and the leading section being arranged on fluid jet pipe 200 reduces.

Then, pulsation generating unit 100 makes piezoelectric element 401 drive according to the drive singal that drive control part 600 exports, and pass through the volume of alter room 501, pressure is applied with pulse type convection cell, fluid is converted to pulsating flow, by fluid jet pipe 200, nozzle 211 with pulse type high velocity jet fluid.

Be connected by control cables 630 between drive control part 600 with pulsation generating unit 100, the drive singal for driving pressure electric device 401 that drive control part 600 exports is passed to pulsation generating unit 100 by control cables 630.

Further, be connected between drive control part 600 with pump 700 by communication cable 640, the communication protocol that drive control part 600 and pump 700 specify according to CAN (control area net（CAN）) etc. exchanges various instruction and data each other.

Further, the operation implementer that drive control part 600 accepts freely to use pulsation generating unit 100 to hold cutter waits the signal input of the various switches of operation, by above-mentioned control cables 630 and communication cable 640, and control pump 700 and pulsation generating unit 100.

As the above-mentioned switch be connected with drive control part 600, there is generating unit starting switch 625 of such as pulsing, spray (not shown) such as intensity change-over switch 627, degassed switches (Off ラ ッ シ Application グ ス イ ッ チ) 628.

Pulsation generating unit starting switch 625 is for switching with or without (open and close) switch from the fluid jet of pulsation generating unit 100.When the operation implementer using pulsation generating unit 100 to hold cutter operates pulsation generating unit starting switch 625, drive control part 600 is combined with pump 700, carries out the control for making fluid spray from pulsation generating unit 100 or stop.Pulsation generating unit starting switch 625 can take the form of the foot switch being placed on the operation of operation implementer's foot limit, also can take to arrange integratedly with the pulsation generating unit 100 held by the implementer that performs the operation, by the operation hands of implementer and the form of finger manipulation.

Spray the switch that intensity change-over switch 627 is the injection intensity for changing the fluid sprayed from pulsation generating unit 100.When spraying intensity change-over switch 627 by operation, drive control part 600 carries out for increasing pulsation generating unit 100 and pump 700 or reduces the control of injection intensity of fluid.

In addition, to degassed switch 628, will be explained below.

And in present embodiment, pulsating flow refers to that the flow direction of fluid is certain, the flowing of the fluid that the flow of fluid or flow velocity fluctuate along with periodicity or aperiodicity.Pulsating flow also comprises the flowing of repetition fluid and the intermittent flow of stopping, as long as but the flow of fluid or flow velocity periodically or aperiodicity fluctuate, therefore, without the need to being intermittent flow.

Similarly, the injection of the flow of sprayed fluid or the fluid of flow velocity periodicity or aperiodicity fluctuation is referred to pulse type jet fluid.As the example that pulse type sprays, the injection of repetition fluid and the interrupted injection of non-ejection can be enumerated, as long as but the flow of the fluid sprayed or flow velocity periodically or aperiodicity fluctuate, therefore, without the need to being interrupted injection.

And when generating unit 100 of pulsing stops driving, that is, during the volume of not alter room 501, the fluid provided by the pump 700 as fluid supply unit under authorized pressure is flowed out from nozzle 211 continuously by fluid chamber 501.

In addition, fluid ejection apparatus 1 according to the present embodiment can be the formation possessing multiple pump 700.Such as, Fig. 2 exemplifies formation when fluid ejection apparatus 1 possesses 2 pumps 700.

In this case, as shown in Figure 2, fluid ejection apparatus 1 possesses the first pump 700a and the second pump 700b.Further, connect pulsation generating unit 100 and the first pump 700a and the second pump 700b, and the access path (connecting pipings) becoming the stream of fluid flowing is made up of the first connection tube 25a, the second connection tube 25b, connection tube 25 and three-way cock 26.

And, switchable valve will be configured to use as three-way cock 26, first connection tube 25a is communicated with connection tube 25, or make the second connection tube 25b be communicated with connection tube 25 between switch, optionally to use any one pump in the first pump 700a and the second pump 700b.

By such formation, such as, when optionally using the first pump 700a, the supply of fluid cannot carried out under such circumstances from the first pump 700a due to certain reasons such as faults, make after the second connection tube 25b is communicated with connection tube 25 by switching three-way cock 26, the supply of fluid from the second pump 700b, thus can continue to use fluid ejection apparatus 1, and can suppress carrying out from the first pump 700a the impact that fluid supply causes in Min..

In addition, in the following description, even if fluid ejection apparatus 1 is the formation possessing multiple pump 700, when illustrating without the need to distinguishing each pump 700, unification represents with pump 700.

On the other hand, needs multiple pump 700 distinguished respectively be illustrated time, then each pump 700 is distinguished and represents with the first pump 700a, the second pump 700b etc., after the reference marks 700 of pump 700, suitably add the suffix such as a, b.Further, in this case, suffix a is added to the reference marks of the element of the first pump 700a, suffix b is added to the reference marks of the element of the second pump 700b and represents.

===pump===

Next, with reference to Fig. 3, the formation of pump 700 according to the present embodiment and the summary of action are described.

Pump 700 according to the present embodiment possesses pump control part 710, slide block (moving body) 720, motor 730, line slideway 740 and pinch valve (passage opening/closing portion) 750.And pump 700 is configured to the fluid container installation portion 770 of the fluid container 760 had for removably installing containing fluid.When being provided with fluid container 760, fluid container installation portion 770 is to keep the mode of fluid container 760 to be formed in the position of regulation.

In addition, details will be explained below, and pump control part 710 and slide block release-push 780, slide block arrange switch 781, liquor charging ready switch 782, (the プ ラ イ ミ Application グ ス イ ッ チ) 783 that fill switch, pinch valve switch 785 are connected (not shown).

As the example of in present embodiment, fluid container 760 is configured to the injection tube possessing syringe 761 and plunger 762.

In this fluid container 760, be formed with the peristome (fluid issuing) 764 of the shape that cylinder is given prominence in the leading section of syringe 761.Then, when being arranged on fluid container installation portion 770 by fluid container 760, the end of connection tube 25 is embedded in peristome 764, thus form the stream from the inside of syringe 761 to the fluid of connection tube 25.

Pinch valve 750 is arranged on the path of connection tube 25, by the valve that the stream of the fluid between fluid container 760 and pulsation generating unit 100 opens or closes.

Opening or closing of pinch valve 750 is carried out by pump control part 710.When pump control part 710 opens pinch valve 750, the fluid communication between fluid container 760 and pulsation generating unit 100.During pump control part 710 occlusion clip pipe valve 750, the stream between fluid container 760 and pulsation generating unit 100 cuts off.

Fluid container 760 is arranged on after on fluid container installation portion 770, under the state opening pinch valve 750, make the plunger 762 of fluid container 760 (following to the direction pushed in syringe 761, also referred to as pushing direction or press direction) mobile time, by be arranged on plunger 762 above-mentioned to push the space that the end faces of resinous pad 763 such as the tool rubber springy of the front portion of side, direction and the inwall of syringe 761 be surrounded as (following, also referred to as fluid containment portion 765) volume reducing, be filled in the fluid in this fluid containment portion 765 to spue from the peristome 764 of the leading section of syringe 761.Then, the fluid filled spued from peristome 764 is to connection tube 25, and supply pulsation generating unit 100.

On the other hand, fluid container 760 is arranged on after on fluid container installation portion 770, under the state of closed clip pipe valve 750, make the plunger 762 of fluid container 760 to push direction move time, the volume reducing in the fluid containment portion 765 be surrounded as with the inwall of syringe 761 by the pad 763 of the front portion being arranged on plunger 762, thus the pressure increase of the fluid be filled in this fluid containment portion 765 can be made.

By when fluid container 760 is installed on fluid container installation portion 770, direction that pump control part 710 makes slide block 720 slide along plunger 762 (above-mentioned push direction and with the above-mentioned side of pushing in the opposite direction) the mobile movement carrying out plunger 762.

Specifically, slide block 720 is installed on line slideway 740, the guide rail (not shown) that the base portion 721 of slide block 720 and the glide direction along above-mentioned plunger 762 are formed on line slideway 740 with linearity engages, then, the power transmitted from the motor 730 driven by pump control part 710 is utilized by line slideway 740, the base portion 721 of slide block 720 is moved along guide rail, thus slide block 720 move along the glide direction of above-mentioned plunger 762.

And, as shown in Figure 3, along the above-mentioned guide rail of line slideway 740, be provided with the first limit sensors 741, sensor for residual amount 742, beginning level sensor (ホ ー system セ ン サ ー) (position detection part) 743, second limit sensors 744.

These first limit sensors 741, sensor for residual amount 742, beginning level sensor 743, second limit sensors 744 are the sensor detecting the position of the slide block 720 of movement on the above-mentioned guide rail of line slideway 740, and the signal detected by these sensors is transfused to pump control part 710.

Beginning level sensor 743 is sensors of the initial position (hereinafter also referred to as position, beginning position) for determining the slide block 720 on line slideway 740.Position, beginning position is the position keeping slide block 720 when carrying out the operations such as the installation of fluid container 760 and replacing.Further, position, beginning position is decided to be when slide block 720 is positioned at beginning position, position, slide block 720 do not contact such position with plunger 762.

Sensor for residual amount 742 be for slide block 720 by position, beginning position to plunger 762 push direction move time, the sensor of the position (following, to be also labeled as surplus position) of the slide block 720 when the surplus of the fluid in test fluid container 760 reaches below setting.When slide block 720 moves to the surplus position being provided with sensor for residual amount 742, the alarm of regulation is exported to operator (operation implementer or auxiliary).Then, according to the judgement of operator, in suitable timing, carry out the operation current fluid container 760 used being replaced by new fluid container 760.Or, when having prepared the second pump 700b with pump 700 (the first pump 700a) the same preparation formed, having carried out handover operation, having made to carry out supplying the fluid of pulsation generating unit 100 from the second pump 700b of preparation.

First limit sensors 741 illustrates the extreme position (following, be also labeled as first extreme position) that push mobile range when direction move of slide block 720 from position, beginning position to plunger 762.When slide block 720 moves to the first extreme position being provided with the first limit sensors 741, the surplus when surplus of the fluid in fluid container 760 is positioned at above-mentioned surplus position than slide block 720 is less, and the warning of regulation is exported to operator.Then, in this case, also carry out the operation current fluid container 760 used being replaced by new fluid container 760, or carry out the operation of the second pump 700b switching to preparation.

On the other hand, the second limit sensors 744 illustrate slide block 720 by position, beginning position to contrary with the direction pushing plunger 762 reverse mobile time the extreme position (following, to be also labeled as the second extreme position) of mobile range.When slide block 720 moves to the second extreme position being provided with the second limit sensors 744, also export the warning of regulation.

In addition, slide block 720 is provided with touch sensor (contact detecting) 723 and pressure transducer (pressure detecting portion) 722.

Touch sensor 723 be whether contact with the plunger 762 of fluid container 760 for detecting slide block 720, namely, for detecting the sensor whether slide block 720 contacts with fluid containment portion 765.Touch sensor 723 exports connection signal when slide block 720 contacts with the plunger 762 of fluid container 760, exports cut-off signal when not contacting.

And, pressure transducer 722 is the pressure of the fluid detected in the fluid containment portion 765 that formed by inwall and the pad 763 of syringe 761, namely pressure when slide block 720 pushes fluid containment portion 765, and the sensor exporting the signal (detection signal) of the level (such as voltage, electric current, frequency) corresponding to this pressure.

When make under the state at closed clip pipe valve 750 slide block 720 to above-mentioned push direction move time, the pressure of the fluid in fluid containment portion 765, after slide block 720 contact plunger 762, rises along with the increase of the amount of pushing of slide block 720.

On the other hand, when make under the state opening pinch valve 750 slide block 720 to above-mentioned push direction move time, even if after slide block 720 contacts plunger 762, fluid in fluid containment portion 765 also can be flowed out by the nozzle 211 of connection tube 25 from pulsation generating unit 100, therefore, although the pressure of the fluid in fluid containment portion 765 can rise to a certain degree, even if make slide block 20 to pushing direction movement further, also can not rise again.

In addition, the signal from touch sensor 723 and pressure transducer 722 is transfused to pump control part 710.

And, in the following description, sometimes also slide block 720, motor 730 and line slideway 740 are recited as fluid pressing portion 731.Fluid pressing portion 731 pushes fluid containment portion 765, and fluid is flowed out from the peristome (fluid issuing) 764 of fluid container 760.

Next, to the fluid container 760 being filled with fluid is reinstalled on fluid container installation portion 770, and by the fluid supply pulsation generating unit 100 in fluid container 760, can be described from pulsation generating unit 100 with the warming up of the state of pulse type jet fluid until become.

First, operator operates slide block release-push 780, by the connection signal front pump control part 710 of slide block release-push 780.Thus, pump control part 710 makes slide block 720 move to position, beginning position.

Then, the fluid container 760 be in advance connected with connection tube 25 is installed on fluid container installation portion 770 by operator.In addition, in the syringe 761 of this fluid container 760, fluid is filled with.

Then, connection tube 25 is installed to after on pinch valve 750 by operator, when the connection signal of pinch valve switch 785 is inputed to pump control part 710 by operation pinch valve switch 785, and pump control part 710 closed clip pipe valve 750.

Next, operator operates slide block and arranges switch 781, slide block is arranged the connection signal front pump control part 710 of switch 781.So, pump control part 710 makes slide block 720 move to pushing direction, and starts to control, and the pressure of the fluid that the fluid containment portion 765 in fluid container 760 is held becomes the target pressure value of regulation.

Then, after pressing liquor charging ready switch 782 by operator, the connection signal of this liquor charging ready switch 782 is transfused to pump control part 710, when the pressure of the fluid in fluid containment portion 765 enters in the scope of regulation (following relative to above-mentioned target pressure value, also be labeled as rough window (ラ Off ウ イ Application De ウ)) time, pump control part 710 become allow to carry out the liquor charging of fluid from pump 700 to pulsation generating unit 100 can liquor charging state.

Then, when pump control part 710 be in can liquor charging state time, by the operation of operator by fill switch 783 connection signal front pump control part after, pump control part 710 starts to fill (プ ラ イ ミ Application グ) process.Filling process is the process making from fluid container 760 to connection tube 25, be full of the stream of fluid the fluid jet peristome 212 of generating unit 100 of pulsing fluid.

After filling process starts, pump control part 710 opens pinch valve 750, and opening the timing (time differences of about such as several milliseconds to a few tens of milliseconds) simultaneously or almost simultaneously of pinch valve 750, starts slide block 20 is moved to pushing direction.The movement of slide block keeps certain fixing speed to carry out with the sendout of the fluid time per unit flowed out from fluid container 760.Fill the carrying out of process until have passed through the stipulated time (or until slide block 720 moves predetermined distance) of filling needed for process, or until operator operates fill switch 783 (not shown) input cut-off signal.

Thus, the fluid of the ormal weight in fluid containment portion 765 can be sent from pump 700 with the flow velocity (discharge-amount of the fluid of time per unit) of regulation, be full of the connection tube 25 from pinch valve 750 to pulsation generating unit 100, and be full of the pulsation fluid chamber 501 of generating unit 100 and fluid jet pipe 200 etc.In addition, the air be present in before starting to fill process in connection tube 25 and in pulsation generating unit 100 can flow in connection tube 25 and pulsation generating unit 100 along with fluid, and is discharged into air from the nozzle 211 of pulsation generating unit 100.

In addition, make the afore mentioned rules speed of slide block 720 movement, predetermined distance or stipulated time when filling process, be stored in pump control part 710 all in advance.

Thus, fill process to terminate.

Next, when the connection signal of degassed switch 628 is transfused to drive control part 600 by the operation of operator, drive control part 600 and pump control part 710 start degassed process.

Degassed process is the process for being discharged from the nozzle 211 of pulsation generating unit 100 by bubble remaining in connection tube 25 and pulsation generating unit 100.

In degassed process, under the state opening pinch valve 750, reach certain fixing speed with the sendout of the fluid time per unit flowed out from fluid container 760, pump control part 710 makes slide block 720 move to pushing direction, and by fluid supply pulsation generating unit 100.And drive control part 600 links with the spuing of fluid based on pump 700, drive the piezoelectric element 401 of pulsation generating unit 100, eject fluid from pulsation generating unit 100.Thus, the bubble remained in connection tube 25 and pulsation generating unit 100 is discharged by the nozzle 211 from pulsation generating unit 100.The carrying out of degassed process is until through stipulated time (or slide block 720 move predetermined distance till), or until operator operates degassed switch 628 and inputs cut-off signal.

In addition, during degassed process, make the afore mentioned rules speed of slide block 720 movement, stipulated time or predetermined distance, be stored in drive control part 600 and pump control part 710 in advance.

After degassed process terminates, pump control part 710 closed clip pipe valve 750, and detect the pressure being contained in the fluid in the fluid containment portion 765 of fluid container 760.Then, carry out the control of the position adjusting slide block 720, make this pressure become above-mentioned target pressure value.

Then, when the pressure of the fluid in fluid containment portion 765 enters (in rough window) in the scope of afore mentioned rules relative to target pressure value, becoming can with the state of pulse type from pulsation generating unit 100 jet fluid.

In this state, when operation implementer makes pulsation generating unit starting switch 625 by foot operation, after the connection signal of pulsation generating unit starting switch 625 is transfused to drive control part 600, the signal that pump control part 710 sends according to drive control part 600, open pinch valve 750, in the timing (such as about several milliseconds of time differences to a few tens of milliseconds) simultaneously or almost simultaneously that pinch valve 750 is opened, slide block 720 being moved to pushing direction with fixing speed, starting to provide fluid to pulsation generating unit 100.On the other hand, drive control part 600 starts the driving of piezoelectric element 401, and the volume of alter room 501 also produces pulsating flow.Thus, fluid is gone out with pulse type from nozzle 211 high velocity jet of the front portion of pulsation generating unit 100.

Afterwards, when operation implementer makes pulsation generating unit starting switch 625 by foot operation, after the cut-off signal of pulsation generating unit starting switch 625 is transfused to drive control part 600, drive control part 600 stops the driving of piezoelectric element 401.Then, the signal that pump control part 710 sends according to drive control part 600, makes the mobile of slide block 720 stop and closed clip pipe valve 750.In this way, fluid stops from the injection of pulsation generating unit 100.

It should be noted that, pump 700 is according to the present embodiment formations that slide block 720 pushes fluid container 760, and fluid container 760 is configured to the injection tube with syringe 761 and plunger 762, and pump 700 also can be the formation shown in Fig. 4.

Pump 700 shown in Fig. 4 has following formation: be arranged in compression chamber 800 by the fluid container 760 transfusion bag as containing fluid formed, after air tranquilization compressor 810 being provided via actuator 811, force feed is in compression chamber 800, thus pushing fluid container 760.

When opening pinch valve 750 under the state pushing fluid container 760 to the air pressurized in compression chamber 800, the fluid be contained in the fluid containment portion 765 of fluid container 760 flows out from peristome 764, and is supplied to pulsation generating unit 100 via connection tube 25.

It should be noted that by opening air bleeding valve 812 by the air venting in compression chamber 800 in air.And, when the pressure of the air in compression chamber 800 exceedes authorized pressure, even without opening air bleeding valve 812, air venting in compression chamber 800 also can be made in air by the unlatching of relief valve 813.

In addition, Fig. 4 goes out although not shown, but above-mentioned compressor 810, actuator 811, air bleeding valve 812, pinch valve 750 control by pump control part 710.

And the detection signal exported by the sensor for residual amount 742 of the surplus of the fluid in the pressure transducer 722 of the pressure of the fluid in test fluid container 760 and test fluid container 760 is also transfused to pump control part 710.

And, when shown in Fig. 4 pump 700, form fluid pressing portion 731 by compressor 810, actuator 811 and compression chamber 800.

By making pump 700 in this way, the amount that time per unit can supply the fluid of pulsation generating unit 100 can be increased.In addition, pulsation generating unit 100 can be applied the fluid to higher pressure, the transfusion bag of containing fluid directly can also be used as fluid container 760, therefore, can the pollution of anti-fluid.And, also can not produce pulsating flow to pulsation generating unit 100, and carry out continuous liquor charging.

In addition, in present embodiment, drive control part 600 is arranged on the position be separated with generating unit 100 of pulsing with pump 700, but also can adopt the mode be integrally constituted with pump 700.

And when using this fluid ejection apparatus 1 to perform the operation, the position that operation implementer holds is pulsation generating unit 100.Therefore, the connection tube 25 being preferably connected to pulsation generating unit 100 is soft as much as possible.For this reason, connection tube 25 is not only soft but also thin pipes, and the pressure that spues of the fluid preferably flowed out from pump 700 is can be set as low pressure in the scope of pulsation generating unit 100 liquor charging.Therefore, the pressure that spues of pump 700 is roughly set as 0.3 atmospheric pressure (0.03MPa) below.

And especially doing cerebral operations like that, when equipment is out of order and probably causes major accident, must avoid the fluid ejection of the high pressure when connection tube 25 cut-out waits, for this reason, also needing prior is low pressure by the pressure setting that spues of pump 700.

==pulsation generating unit==

Next, the structure of the pulsation generating unit 100 of present embodiment is described.

Fig. 5 is the sectional view of the structure of the pulsation generating unit 100 illustrated according to the present embodiment.In Figure 5, pulsation generating unit 100 is connected with fluid jet pipe 200, and this fluid jet pipe 200 comprises the pulse generating device of the pulsation producing fluid, also has the connection stream 201 of the stream as the fluid that spues.

In pulsation generating unit 100, upper shell 500 and lower house 301 engage on surface relative separately, are screwed togather by 4 hold-down screws 350 (omitting diagram).Lower house 301 is the cartridges with flange part, and an end is sealed by base plate 311.Piezoelectric element 401 is provided with in the inner space of this lower house 301.

Piezoelectric element 401 forms actuator, is Piezoelektrisches mehrschichtelement.An end of piezoelectric element 401 is fixed on barrier film 400 by upper plate 411, and another end winding support is at the upper surface 312 of base plate 311.

And barrier film 400 is formed by discoid sheet metal, in the recess 303 of lower house 301, marginal portion is closely bonded in the bottom surface of recess 303.By changing piezoelectric element 401 input drive signal of unit to as volume, along with the elongation of piezoelectric element 401, contraction and by the volume of barrier film 400 alter room 501.

At the stacked gusset plate 410 being provided with the discoid sheet metal that there is peristome by central part and forming of the upper surface of barrier film 400.

In upper shell 500, be formed with recess at the central part on the surface relative with lower house 301, be made up of this recess and barrier film 400 and the rotary body shape being filled with the state of fluid is fluid chamber 501.That is, fluid chamber 501 is the spaces by the sealing surface 505 of the recess of upper shell 500 and inner circumferential sidewall 501a and barrier film 400 encirclement.Run through in the substantially central portion of fluid chamber 501 and be provided with outlet flow passage 511.

Outlet flow passage 511 is from the end of the through outlet flow passage pipe 510 projecting to an end face by upper shell 500 of fluid chamber 501.The connecting portion of outlet flow passage 511 and the sealing surface 505 of fluid chamber 501 by sphering smoothly, to reduce fluid resistance.

In addition, in present embodiment (with reference to Fig. 5), the shape of fluid chamber 501 described above is general cylindrical shape of two ends sealing, but is not limited only to cylindrical shape, also can be for conical, trapezoidal in side-looking is observed, or hemispherical etc.Such as, if outlet flow passage 511 and the connecting portion of sealing surface 505 are formed as the such shape of funnel, then the bubble in fluid chamber 501 described later can easily be discharged.

Outlet flow passage pipe 510 is connected with fluid jet pipe 200.Fluid jet pipe 200 runs through to be provided with and connects stream 201, connects the diameter of stream 201 larger than the diameter of outlet flow passage 511.And the thickness in the pipe portion of fluid jet pipe 200 is formed in the scope of the rigidity of the pressure fluctuation with not absorption fluids.

The leading section of fluid jet pipe 200 is inserted with nozzle 211.This nozzle 211 is through is provided with fluid jet peristome 212.The diameter of fluid jet peristome 212 is less than the diameter connecting stream 201.

Projecting in the side of upper shell 500 have the inlet fluid path pipe (fluid taking mouth) 502 inserting and provide the connection tube 25 of fluid from pump 700, is through with the connection stream 504 of inlet fluid path side in inlet fluid path pipe 502.Connect stream 504 to be communicated with inlet fluid path 503.Inlet fluid path 503 is formed as channel-shaped at the edge part of the sealing surface 505 of fluid chamber 501, and is communicated with fluid chamber 501.

At upper shell 500 with on the composition surface of lower house 301, on the position of peripheral direction leaving barrier film 400, lower house 301 side is formed with seal box (パ ッ キ Application ボ ッ Network ス) 304, upper shell 500 side is formed with seal box 506, in the space formed, O-ring seal 450 is housed by seal box 304,506.

Here, when assembling upper shell 500 and lower house 301, by the bottom surface of the edge part of the sealing surface 505 of upper shell 500 and the recess 303 of the lower house 301 edge part compact siro spinning technology by the edge part of barrier film 400 and gusset plate 410.At this moment, sealing ring 450 is pushed by upper shell 500 and lower house 301, thus anti-fluid is leaked from fluid chamber 501.

In fluid chamber 501, the high pressure conditions of more than 30 atmospheric pressure (3MPa) is reached when fluid spues, although think that having a little fluid at each junction surface of barrier film 400, gusset plate 410, upper shell 500, lower house 301 leaks, and is stoped by sealing ring 450 and leaks.

After being provided with sealing ring 450 as shown in Figure 5, then sealing ring 450 can be compressed by the pressure of the fluid leaked from fluid chamber 501 with high pressure, simultaneously sealing ring 450 is strongly pressed on the inwall of seal box 304,505 further, therefore, it is possible to the leakage of anti-fluid more reliably.In this way, pressure increase higher in fluid chamber 501 can be kept when driving.

Next, with reference to accompanying drawing, the inlet fluid path 503 being formed in upper shell 500 is described in detail.

Fig. 6 is the top view of the mode that inlet fluid path 503 is shown, represents the state of the upper shell 500 observed from the side, composition surface with lower house 301.

In Fig. 6, inlet fluid path 503 is formed as channel-shaped at the edge part of the sealing surface 505 of upper shell 500.

An end of inlet fluid path 503 is communicated to fluid chamber 501, and another end is communicated to and connects stream 504.Fluid reservoir 507 is formed with the connecting portion being connected stream 504 at inlet fluid path 503.Then, by make the connecting portion of fluid reservoir 507 and inlet fluid path 503 smoothly sphering reduce fluid resistance.

And inlet fluid path 503 is communicated to the inner circumferential sidewall 501a of fluid chamber 501 towards roughly tangential direction.The fluid provided by pump 700 (with reference to Fig. 1) with authorized pressure flows along inner circumferential sidewall 501a (in Fig. 6, the direction indicated by arrow) and produces swirling flow in fluid chamber 501.Swirling flow the centrifugal force that produces by convolution push inner circumferential sidewall 501a side to, meanwhile, the bubble contained in fluid chamber 501 concentrates on the central part of swirling flow.

Then, the bubble concentrating on central part is discharged by from outlet flow passage 511.Therefore, preferably outlet flow passage 511 is arranged on the immediate vicinity of swirling flow, i.e. the axle central part of rotary body shape.

And as shown in Figure 6, inlet fluid path 503 is bending.Inlet fluid path 503 also can be set to do not bend and be communicated to fluid chamber 501 along straight line, but bend by making it, can be elongated by stream, thus required inertia (イ ナ ー タ Application ス can be obtained in narrow space) (for inertia, will be explained below).

In addition, as shown in Figure 6, between barrier film 400 and the edge part of sealing surface 505 being formed with inlet fluid path 503, gusset plate 410 is provided with.The durability that gusset plate 410 is intended to improve barrier film 400 is set.Owing to being formed with the connection opening portion 509 of incision-like at inlet fluid path 503 and the connecting portion of fluid chamber 501, therefore, can think when barrier film 400 is driven with altofrequency, stress occur near connection opening portion 509 and concentrates, thus fatigue rupture occurs.Therefore, by arranging the gusset plate 410 with non-incision portion and continuous print peristome, can make barrier film 400 that stress does not occur and concentrating.

And offer the screw hole 500a of 4 positions in corner, the periphery portion of upper shell 500, upper shell 500 and lower house 301 are screwed togather joint by screw on this screw hole position.

In addition, although the diagram of omission, gusset plate 410 can be engaged with barrier film 400, laminate adhesive is integrated.As adhesive bonding method, can be the method using binding agent bonding, also can be the method such as solid-state diffusion joint and welding, but more preferably make the method that gusset plate 410 and barrier film 400 are adjacent on composition surface.

==pulsation generating unit action==

Next, be described with reference to the action of Fig. 1 ~ Fig. 6 to the pulsation generating unit 100 of present embodiment.Fluid based on the pulsation generating unit 100 of present embodiment spues, and is carried out with the difference of the inertia L2 (being sometimes referred to as " synthesizing inertia L2 ") of outlet flow passage 511 side by the inertia L1 (being sometimes referred to as " synthesis inertia L1 ") of inlet fluid path 503 side.

< inertia >

First, inertia is described.

When the sectional area setting the density of fluid as ρ, stream be S, the length of stream be h time, inertia L L=ρ × h/S represents.When set the pressure differential of stream as Δ P, the flow that flows through the fluid of stream be Q time, by using inertia L to make the equation of motion in stream be out of shape, this relation of Δ P=L × dQ/dt can be derived.

That is, inertia L represents the influence degree of the time variations to flow, and inertia L is larger, and the time variations of flow is less, and inertia L is less, and the time variations of flow is larger.

And the synthesis inertia be connected in series of being connected in parallel of relevant many streams, stream that many strips are different, can calculate by making to synthesize in the same manner as being connected in parallel or being connected in series of the inertia of each stream and the inductance in circuit.

In addition, the inertia L1 of inlet fluid path 503 side, because the diameter connecting stream 504 is set as enough large relative to the diameter of inlet fluid path 503, therefore, inertia L1 calculates in the scope of inlet fluid path 503.At this moment, with the connection tube 25 of inlet fluid path 503, there is flexibility owing to connecting pump 700, therefore can delete from the calculating of inertia L1.

And about the inertia L2 of outlet flow passage 511 side, because the diameter connecting stream 201 is large more than the diameter of outlet flow passage 511, and the thickness in the pipe portion (tube wall) of fluid jet pipe 200 is thin, be therefore slight on the impact of inertia L2.Therefore, the inertia L2 of outlet flow passage 511 side can replace with the inertia of outlet flow passage 511.

In addition, the tube wall of fluid jet pipe 200 has enough rigidity of the pressure propagation of convection cell.

And in the present embodiment, flow path length and the sectional area of the flow path length of inlet fluid path 503 and sectional area, outlet flow passage 511 are set to, and make the inertia L1 of inlet fluid path 503 side larger than the inertia L2 of outlet flow passage 511 side.

The injection > of < fluid

Next, the action of pulsation generating unit 100 is described.

Fluid supplies inlet fluid path 503 by pump 700 with authorized pressure.Its result, when piezoelectric element 401 is failure to actuate, fluid utilizes the difference of the fluid resistance value of the power that spues of pump 700 and inlet fluid path 503 side entirety to flow in fluid chamber 501.

Here, when drive singal is imported in piezoelectric element 401, when piezoelectric element 401 sharply extends, if inertia L1, L2 of inlet fluid path 503 side and outlet flow passage 511 side have enough sizes, then the pressure in fluid chamber 501 rises rapidly and reaches tens atmospheric pressure.

Because the pressure in this fluid chamber 501 is more than utilizing pump 700 pairs of inlet fluid path 503 applied pressures large, therefore, can reduces because of this pressure from the fluid inlet fluid path 503 side inflow fluid chamber 501, can increase from the outflow of outlet flow passage 511.

Because the inertia L1 of inlet fluid path 503 is larger than the inertia L2 of outlet flow passage 511, because the recruitment of the fluid spued from outlet flow passage 511 is larger from the reduction of the flow of inlet fluid path 503 incoming fluid room 501 than fluid, therefore, fluid can spue with pulse type at connection stream 201, that is, pulsating flow can be there is.Pressure oscillation when this spues is propagated in fluid jet pipe 200, and fluid is ejected from the fluid jet peristome 212 of the nozzle 211 of front end.

Here, because the diameter of the fluid jet peristome 212 of nozzle 211 is less than the diameter of outlet flow passage 511, therefore, fluid is ejected by the pulse type drop as high pressure, high speed further.

On the other hand, in fluid chamber 501, due to the minimizing of Fluid Volume and the interaction of the increase of the discharge of the fluid flowed out from outlet flow passage 511 that flow into from inlet fluid path 503, after pressure increase, become negative pressure state immediately.Its result, because of both the negative pressure state in the pressure of pump 700 and fluid chamber 501, after the stipulated time, the flowing that the fluid of inlet fluid path 503 flows in fluid chamber 501 with the speed identical with before piezoelectric element 401 action is resumed.

After the flowing of the fluid in inlet fluid path 503 returns, if piezoelectric element 401 stretches, then can continue to spray pulsating flow from nozzle 211.

The eliminating > of < bubble

Next, the eliminating action of the bubble in fluid chamber 501 is described.

As mentioned above, inlet fluid path 503 by circling round while this path close to fluid chamber 501 is communicated to fluid chamber 501 around fluid chamber 501.And outlet flow passage 511 is arranged near the rotating shaft of roughly rotary body shape of fluid chamber 501.

Therefore, circle round fluid chamber 501 from the fluid of inlet fluid path 503 incoming fluid room 501 along inner circumferential sidewall 508.Then, fluid is pushed to the inner circumferential sidewall 501a side of fluid chamber 501 due to centrifugal force, the bubble contained by fluid concentrates on the central part of fluid chamber 501, its result, and bubble is discharged by from outlet flow passage 511.

Therefore, even if there is small volume change due to piezoelectric element 401 in fluid chamber 501, pressure oscillation also can not be hindered because of bubble, and can obtain enough pressure increase.

According to the present embodiment, because fluid is supplied to inlet fluid path 503 with the pressure of regulation by pump 700, and, even if under the state of driving that stopped pulsation generating unit 100, fluid also can be supplied to inlet fluid path 503 and fluid chamber 501, therefore, even if do not carry out startup water filling (exhaling び water) action, also initial actuating can be started.

And because the fluid jet peristome 212 of fluid from the reduced than outlet flow passage 511 sprays, therefore, hydraulic pressure increases than in outlet flow passage 511, thus fluid jet is at a high speed made to become possibility.

And, because fluid jet pipe 200 has the rigidity that the pulsation of the fluid flowed from fluid chamber 501 can be delivered to fluid jet peristome 212, therefore, there is the pressure propagation of the fluid that can not hinder self-pulsing generating unit 100, and this effect of required pulsating flow can be sprayed.

And, it is larger than the inertia of outlet flow passage 511 due to the inertia of inlet fluid path 503 is set as, therefore, with flow to from inlet fluid path 503 fluid chamber 501 fluid influx minimizing degree compared with, the increase of discharge greatly can occur outlet flow passage 511, thus the fluid that can carry out pulse type in fluid jet pipe 200 spues.Therefore, also check-valves can not be set in inlet fluid path 503 side, so both can reach the effect of the structure simplifying pulsation generating unit 100, inner cleaning can be made simultaneously to become easy, and the worry to durability resulting from and use check-valves can be got rid of.

In addition, by setting enough large by the inertia of both inlet fluid path 503 and outlet flow passage 511, if sharply reduce the volume of fluid chamber 501, then the pressure in fluid chamber 501 can be made sharply to increase.

And, be used as volume to change the piezoelectric element 401 of unit and barrier film 400 by adopting and the structure of pulsation occurs, the structure of pulsation generating unit 100 can be simplified, and realize miniaturization.And, the peak frequency that the volume of fluid chamber 501 changes can be set as the altofrequency of more than 1KHz, thus be most suitable for the injection of high speed pulsating flow.

And, the fluid generation swirling flow of pulsation generating unit 100 by utilizing inlet fluid path 503 to make in fluid chamber 501, centrifugal force can be utilized to push the fluid in fluid chamber 501 peripheral direction of fluid chamber 501 to, make the central part of swirling flow, namely, bubble contained by fluid is concentrated near the axle of roughly rotary body shape, and gets rid of bubble from the outlet flow passage 511 near the axle being arranged on roughly rotary body shape.Thus, the reduction of the pressure amplitude that can prevent bubble residence from causing in fluid chamber 501, and the stable driving that can continue pulsation generating unit 100.

And, owing to being formed as making inlet fluid path 503 by surrounding's convolution of an edge fluid chamber 501 while be communicated to fluid chamber 501 close to the path that fluid chamber 501 is such, therefore can without the need to adopting for making fluid just swirling flow can occur at the special structure of the internal rotating of fluid chamber 501.

And the peripheral portion due to the sealing surface 505 in fluid chamber 501 forms the inlet fluid path 503 of flute profile, therefore, just the inlet fluid path 503 as swirling flow generating unit can be formed without the need to increasing part count.

And be equipped with gusset plate 410 by the upper surface at barrier film 400, the peristome periphery of gusset plate 410 drives as fulcrum by barrier film 400, therefore, be difficult to that stress occurs and concentrate, thus the durability of barrier film 400 can be improved.

In addition, if make the corner rounding of the composition surface of gusset plate 410 and barrier film 400, then the stress that can relax barrier film 400 is further concentrated.

And, if by gusset plate 410 and barrier film 400 stacked and be bonded as one, then not only can improve the assembleability of pulsation generating unit 100, the effect of peripheral portion of reinforcing barrier film 400 can also be had.

And, due to the fluid reservoir 507 providing the connection stream 504 of the entrance side of fluid and the connecting portion of inlet fluid path 503 to be provided with trapped fluids from pump 700, therefore, the inertia connecting stream 504 can be suppressed the impact of inlet fluid path 503.

And, due on upper shell 500 composition surface with lower house 301, the position of peripheral direction leaving barrier film 400 is equipped with the sealing ring 450 of ring-type, therefore, can anti-fluid from the leakage of fluid chamber 501, and prevent the pressure in fluid chamber 501 from reducing.

The fault detect of==pressure transducer==

As mentioned above, in fluid ejection apparatus 1 according to the present embodiment, when the pressure being contained in the fluid in fluid containment portion 765 enter (rough window) in the scope of regulation relative to the target pressure value of regulation and become allow from pump 700 to pulsation generating unit 100 conveyance fluid can liquor charging state time, if by the enabling signal input queued switches control part 600 of operation implementer by pulsation generating unit starting switch 625, then drive control part 600 starts the driving of piezoelectric element 401, with the nozzle 211 high speed jet fluid of pulse type from the front end of pulsation generating unit 100.

Fluid ejection apparatus 1 by like this by the Stress control of the fluid in fluid containment portion 765 for entering rough window, thus the fluid jet can carrying out from pulsation generating unit 100 with suitable intensity.

Therefore, when the pressure transducer 722 of the fluid pressure in test fluid accommodation section 765 breaks down because of certain reason, owing to becoming the fluid pressure in uncontrollable fluid containment portion 765, therefore, fluid may be ejected with the beyond thought intensity of implementer of performing the operation from pulsation generating unit 100.

It should be noted that, in the present embodiment, pressure transducer 722 breaks down and refers to: the output characteristics of pressure pressure sensor 722 does not have the situation of normal characteristic.

The normal output characteristics of pressure transducer 722 refers to: be applied to pressure on pressure transducer 722 and corresponding relation between the level of detection signal exported from pressure transducer 722 is in characteristic such in normal prescribed limit.

Fluid ejection apparatus 1 according to the present embodiment can the fault of detected pressures sensor 722.

Details will be explained hereinafter, in fluid ejection apparatus 1 according to the present embodiment, such as, when making slide block (moving body) 720 move to press direction and push fluid containment portion 765 under the state of closed clip pipe valve (passage opening/closing portion) 750, if pressure during slide block 720 contact plunger 762 detected by pressure transducer 722 is more than the second decision content lower than the pressure detected by pressure transducer 722 when the first decision content or slide block 720 non-contact plunger 762, then judge that fault has appearred in pressure transducer 722.

Below, with reference to Fig. 7 to Figure 12, the fault detect process of the pressure transducer 722 of fluid ejection apparatus 1 is according to the present embodiment specifically described.

First, with reference to Fig. 7, the formation of pump control part (control part) 710 is described.

Pump control part 710 is configured to be had: CPU (CPU) 711, memorizer 712, AD (analog/digital) transducer 713.

The detection signal of the level that pressure when pump control part 710 obtains from pressure transducer 722 the fluid containment portion 765 pushing fluid container 760 with fluid pressing portion 731 is corresponding, carries out the control of fluid pressing portion 731.Such as, pump control part 710 is when input has slide block to arrange the connection signal of switch 781, under the state of closed clip pipe valve 750, the drive singal of convection cell pressing portion 731 output regulation carrys out drive motors 730, slide block 720 is moved up in the side of pushing, and control motor 730, make the pressure in the fluid containment portion 765 detected by pressure transducer 722 become the target pressure value of regulation.It should be noted that, fluid pressing portion 731 is configured to have slide block 720, motor 730 and line slideway 740.

CPU 711 administers the control of the entirety of pump control part 710, being stored in program in memorizer 712, that be made up of the code for carrying out various action, realizing the various functions involved by present embodiment by performing.

Memorizer 712, except storage said procedure, also stores various data.Such as, memorizer 712, except storing above-mentioned target pressure value, also stores: represent the first decision content level data (such as magnitude of voltage) of the level (such as voltage) suitable with above-mentioned first decision content (force value), represent the second decision content level data etc. of the level suitable with the second decision content.

The detection signal exported from pressure transducer 722 is transfused to a/d converter 713, and exports the data of the level representing this detection signal from a/d converter 713.Specifically, pressure transducer 722 detects pressure when slide block 720 pushes fluid containment portion 765, and exporting the detection signal of the level (such as voltage) corresponding with this pressure, a/d converter 713 exports the detection level data (such as magnitude of voltage) of the level representing the detection signal exported by pressure transducer 722.

< Fisrt fault check processing >

Below, with reference to Fig. 8 and Fig. 9, the flow process of the Fisrt fault check processing of pressure transducer 722 is according to the present embodiment described.It should be noted that, Fig. 8 is the figure of the situation of change of the level of the detection signal that pressure transducer 722 is shown and the output signal of touch sensor 723, Fig. 9 is the flow chart of the flow process that Fisrt fault check processing is shown.

In the following description, from the time point that the connection signal of slide block release-push 780 is transfused to pump control part 710, the flow process of Fisrt fault check processing is described.

First, CPU 711 detects that input has the connection signal ((B) of Fig. 8, the S1000 of Fig. 9) of slide block release-push 780.Thus, CPU 711 exports the drive singal of regulation by convection cell pressing portion 731, and slide block 720 is moved (S1010 of Fig. 9) to position, beginning position in the opposite direction pushing direction.Thus, plunger 762 moves to the opposite direction pushing direction because of the fluid pressure in fluid containment portion 765, and meanwhile, the fluid pressure in fluid containment portion 765 declines ((C) of Fig. 8).

Make slide block 720 to during the position movement of beginning position at CPU 711, if slide block 720 is separated with plunger 762, output signal then from touch sensor 723 becomes disconnection ((D) of Fig. 8), and the fluid pressure in fluid containment portion 765 stops declining ((E) of Fig. 8).

Then, when CPU 711 then makes slide block 720 continue to move to position, beginning position in the opposite direction pushing direction, slide block 720 arrives the position of beginning level sensor 743.At this moment, CPU 711 detects the connection signal exported from beginning level sensor 743.So CPU 711 makes slide block 720 stop on position, beginning position ((F) of Fig. 8, the S1030 of Fig. 9).

And at this time point, CPU 711 judges that the signal exported from touch sensor 723 connects or disconnects (S1040 of Fig. 9).Because slide block 720 stops at position, beginning position at this time point, therefore, when the signal exported from touch sensor 723 is for connecting, CPU 711 judges that touch sensor 723 breaks down (S1050 of Fig. 9), and performs troubleshooting (S1060 of Fig. 9).

CPU 711 such as exports the alarm of regulation in troubleshooting.Such as, CPU 711 is the speech message that touch sensor 723 breaks down from speaker 790 output content.Or CPU 711 lights the emergency warning lamp (not shown) of regulation.

According to this mode, promptly the situation that touch sensor 723 breaks down can be informed to the operators such as operation implementer, thus further can improve the safety of fluid ejection apparatus 1.

In the S1040 of Fig. 9, when being off from the signal of touch sensor 723 output, CPU 711 continues the detection level data (magnitude of voltage) (S1070 of Fig. 9) obtaining the level (voltage) representing the detection signal exported from pressure transducer 722 from a/d converter 713.

Further, CPU 711 judges this detection level data whether more than the second decision content level data (S1080 of Fig. 9).

Due at this time point, slide block 720 is in position, beginning position and does not contact with plunger 762, pressure in fluid containment portion 765 should be low pressure (lower than the pressure represented by the second decision content described later), therefore, when to detect level data be more than second decision content level data, pressure transducer 722 becomes can not pressure correctly in test fluid accommodation section 765.

Therefore, when detection level data is more than second decision content level data, CPU 711 judges that pressure transducer 722 breaks down (S1090 of Fig. 9), and the troubleshooting put rules into practice (S1100 of Fig. 9).

It should be noted that, the second decision content is set as suitable value by carrying out experiment to wait in advance.Such as, the pressure in the fluid containment portion 765 when switching between connecting and disconnecting the output signal from touch sensor 723 measures, and sets the second decision content as well based on pressure at this moment.Such as, the value that the pressure when the output signal from touch sensor 723 being switched between connecting and disconnecting is added gained with setting (the second setting) is set to the second decision content as well.

By setting like this, when the pressure in convection cell accommodation section 765 reduces pressure, the pressure in fluid containment portion 765 can be made before the output signal from touch sensor 723 switches to disconnection by connection lower than the second decision content, when the pressure in convection cell accommodation section 765 carries out supercharging, the pressure in fluid containment portion 765 can be made after the output signal from touch sensor 723 switches to connection by disconnection more than the second decision content, therefore, it is possible to prevent the error detection of the fault of pressure transducer 722.

When judging that pressure transducer 722 breaks down, CPU 711 exports the alarm of regulation in troubleshooting (S1100 of Fig. 9).Such as, CPU 711 is the speech message that pressure transducer 722 breaks down from speaker 790 output content.Or CPU 711 lights the emergency warning lamp (not shown) of regulation.

According to this mode, promptly the situation that pressure transducer 722 breaks down can be informed to the operators such as operation implementer, thus further can improve the safety of fluid ejection apparatus 1.

In the S1080 of Fig. 9, when the detection level data of pressure transducer 722 is lower than the second decision content level data, CPU 711 sets the first decision content level data (magnitude of voltage) (S1110 of Fig. 9) of expression first decision content (force value).

This first decision content is the decision content of the fault for judging pressure transducer 722 in following subsequent treatment during slide block 720 contact plunger 762.

For the first decision content, same with the second decision content, such as also can by testing etc. in advance, the pressure in the fluid containment portion 765 when switching between connecting and disconnecting the output signal from touch sensor 723 measures, and sets the first decision content based on pressure at this moment.Such as, also the value of gained after deducting the first setting in the pressure when switching between connecting and disconnecting from the output signal from touch sensor 723 can be set to the first decision content.

By this setting, when the pressure in convection cell accommodation section 765 reduces pressure, the pressure in fluid containment portion 765 can be made after the output signal from touch sensor 723 switches to disconnection by connection lower than the first decision content, when the pressure in convection cell accommodation section 765 carries out supercharging, the pressure in fluid containment portion 765 can be made before the output signal from touch sensor 723 switches to connection by disconnection more than the first decision content, therefore, it is possible to prevent the error detection of the fault of pressure transducer 722.

Or, because the level of the detection signal of pressure transducer 722 may occur deviation along with temperature, foozle etc., therefore, the relative value that the level of the detection signal exported from pressure transducer 722 when also the first decision content can be set as stopping at beginning position, position with slide block 720 is benchmark.In this case, even if the output characteristics of pressure transducer 722 has deviation, the error detection of the fault of pressure transducer 722 can also be prevented.

In the present embodiment, from the pressure represented by the detection signal that pressure transducer 722 exports, (that is, when slide block 720 is on the assigned position that do not contact with fluid containment portion 765) when being in beginning position, position at slide block 720 is added that the value of gained after the 3rd setting is as the first decision content.In the present embodiment, the maximum error that may comprise in the detection signal exported from pressure transducer 722 is set to above-mentioned 3rd setting with as the value after being added little as far as possible separately adding part.

In this way, while the error effect of pressure release sensor 722, the exception of the level of the detection signal of the pressure transducer 722 when touch sensor 723 is connected can be detected exactly.

It should be noted that, more preferably not only consider the error of pressure transducer 722, but also consider that the error (such as quantization error etc.) of a/d converter 713 sets above-mentioned 3rd setting of the calculating for the first decision content.

CPU 711 will represent that the first decision content level data of the first decision content determined in the above described manner is stored in (S1110 of Fig. 9) in memorizer 712.

Then, CPU 711 detects that input has slide block to arrange the connection signal (S1120 of Fig. 9) of switch 781.So CPU 711 exports the drive singal of regulation by convection cell pressing portion 731, makes slide block 720 move (S1130 of Fig. 9) to pushing direction.

Then, CPU 711 judges that the signal exported from touch sensor 723 connects or disconnects (S1140 of Fig. 9).When slide block 720 abuts with plunger 762 and starts the pushing of plunger 762 ((G) of Fig. 8), export connection signal ((H) of Fig. 8) from touch sensor 723.

So, CPU 711 detects from touch sensor 723 and outputs connection signal, and obtains the detection level data (magnitude of voltage) (S1150 of Fig. 9) of the level (voltage) representing the detection signal exported from pressure transducer 722 from a/d converter 713.

Then, CPU 711 judges this detection level data whether more than the first decision content level data (S1160 of Fig. 9).

At this time point, slide block 720 has started depressing plunger 762, pressure in fluid containment portion 765 should be higher than the pressure represented by the first decision content, therefore, when detecting level data lower than the first decision content level data, pressure transducer 722 becomes can not pressure accurately in test fluid accommodation section 765.

Therefore, when detecting level data lower than the first decision content level data, CPU 711 judges that pressure transducer 722 breaks down (S1170 of Fig. 9), and the troubleshooting put rules into practice (S1180 of Fig. 9).

When judging that pressure transducer 722 breaks down, CPU 711 exports the alarm of regulation in troubleshooting (S1180 of Fig. 9).Such as, CPU 711 is the speech message that pressure transducer 722 breaks down from speaker 790 output content.Or CPU 711 lights the emergency warning lamp (not shown) of regulation.

According to this mode, promptly the situation that pressure transducer 722 breaks down can be informed to the operators such as operation implementer, thus further can improve the safety of fluid ejection apparatus 1.

In the S1160 of Fig. 9, when the detection level data of pressure transducer 722 is more than first decision content level data, the process of CPU 711 end fault detection.

It should be noted that, when judging that pressure transducer 722 breaks down, CPU 711 also can open pinch valve 750 in troubleshooting (S1100, S1180 of Fig. 9).

According to this mode, even if suppose that the pressure in fluid containment portion 765 becomes the above high pressure of anticipation, also by making the fluid in fluid containment portion 765 flow out the pressure reduced in fluid containment portion 765 from the nozzle 211 of pulsation generating unit 100, therefore, the safety of fluid ejection apparatus 1 can be improved.

Further, when CPU 711 also can open pinch valve 750 in troubleshooting (S1100, S1180 of Fig. 9), fluid ejection apparatus 1 being become can liquor charging state.

According to this mode, even if when pressure transducer 722 breaks down, the connection signal input queued switches control part 600 of pulsation generating unit starting switch 625 also can be made fluid with pulse type from pulsation generating unit 100 high velocity jet by operation pulsation generating unit starting switch 625 by operation implementer.

In this case, such as, make fluid spray the intensity of determining to spray from pulsation generating unit 100 to operation implementer testability, then according to the judgement of operation implementer, even if when pressure transducer 722 breaks down, also can continue operation.

It should be noted that slide block 720 contact plunger 762 and to start the timing of depressing plunger 762 different by disconnecting the timing switching to connection from touch sensor 723 sometimes.Or slide block 720 and the timing that plunger 762 separates are different by connecting the timing switching to disconnection with touch sensor 723 sometimes.

In this case, even if pressure transducer 722 does not have fault, the pressure that sometimes also there will be when touch sensor 723 is connected detected by pressure transducer 722 pressure be less than when the situation of the first decision content or touch sensor 723 disconnect detected by pressure transducer 722 is the situation of more than the second decision content.

Such as, when illustrated in Figure 10, when pressure drop in fluid containment portion 765 ((C) of Figure 10), pressure in fluid containment portion 765 becomes lower than after the first decision content ((D) of Figure 10), and touch sensor 723 becomes disconnection ((F) of Figure 10).And, when pressure increase in fluid containment portion 765, after touch sensor 723 becomes connection ((H) of Figure 10), the pressure in fluid containment portion 765 becomes more than the first decision content ((J) of Figure 10).Also be, in the situation depicted in figure 10, although touch sensor 723 is connected, there is pressure detected by a pressure transducer 722 lower than ((D) ~ (F) of Figure 10, (H) ~ (J)) during the first decision content.

In this case, as shown in Figure 10, when pressure drop in fluid containment portion 765, become from the pressure in fluid containment portion 765 lower than the first decision content ((D) of Figure 10) to have passed through stipulated time t1 during, do not judge that touch sensor 723 connects or disconnects as well.

And, similarly, when pressure increase in fluid containment portion 765, during to connect ((H) of Figure 10) to have passed through stipulated time t2 from touch sensor 723, do not judge whether lower than the first decision content as well (S1140, S1150, S1160 of Fig. 9) pressure in fluid containment portion 765.

In this way, the error detection of the fault of pressure transducer 722 can be prevented.

It should be noted that, the first decision content and the second decision content both can be set to different values, also can be set to identical value.When the first decision content and the second decision content are set to different values, though such as when the pressurization in fluid containment portion 765 and decompression time pressure change different characteristics under such circumstances, also can the fault of detected pressures sensor 722 more accurately.On the other hand, when the first decision content and the second decision content are set to identical value, can the fault verification condition of setting pressure sensor 722 simply.

< second fault detect process >

Next, with reference to the flow chart shown in Figure 11, the second fault detect process is according to the present embodiment described.The the second fault detect process below illustrated is same with Fisrt fault check processing, when making slide block (moving body) 720 move to press direction and push fluid containment portion 765 under the state of closed clip pipe valve (passage opening/closing portion) 750, if the pressure when slide block 720 contact plunger 762 detected by pressure transducer 722 is lower than the first decision content, or, if the pressure when slide block 720 non-contact plunger 762 detected by pressure transducer 722 is more than the second decision content, then judge that pressure transducer 722 breaks down, even if but inoperation slide block release-push 780, slide block arranges switch 781, also can the fault of detected pressures sensor 722.

First, CPU 711 obtains the detection level data (magnitude of voltage) (S2000 of Figure 11) of the level (voltage) representing the detection signal exported from pressure transducer 722 from a/d converter 713.

Further, CPU 711 judges from the output signal of touch sensor 723 is connect or disconnect (S2010 of Figure 11).

When the output signal from touch sensor 723 be connect time, CPU 711 judges that detection level data is whether as more than first decision content level data (S2020 of Figure 11).

When detection level data is more than first decision content level data, the process of CPU 711 end fault detection.

On the contrary, when detecting level data lower than the first decision content level data, CPU 711 judges that output signal from touch sensor 723 is as connecting and detect level data whether continue for more than the first stipulated time (S2030 of Figure 11) lower than the state of the first decision content level data.

When not yet continuing more than first stipulated time, CPU 711 again returns and judges that from the output signal of touch sensor 723 are the process (S2010 of Figure 11) of connecting or disconnecting.

When continue for more than first stipulated time, CPU 711 judges that pressure transducer 722 breaks down (S2040 of Figure 11), and the troubleshooting put rules into practice (S2050 of Figure 11).Troubleshooting can identical with Fisrt fault check processing (S1100, S1180 of Fig. 9).

Such as, when judging that pressure transducer 722 breaks down, CPU 711 exports the alarm of regulation in troubleshooting (S2050 of Figure 11).Such as, CPU 711 is the speech message that pressure transducer 722 breaks down from speaker 790 output content.Or CPU 711 lights the emergency warning lamp (not shown) of regulation.

According to this mode, promptly the situation that pressure transducer 722 breaks down can be informed to the operators such as operation implementer, thus further can improve the safety of fluid ejection apparatus 1.

On the other hand, in S2010, when the output signal from touch sensor 723 is off, CPU 711 judges whether to detect level data lower than the second decision content level data (S2060 of Figure 11).

When detecting level data lower than the second decision content level data, the process of CPU 711 end fault detection.

On the other hand, when detection level data is more than second decision content level data, CPU 711 judges to be off from the output signal of touch sensor 723 and detects level data whether continue for more than the second stipulated time (S2070 of Figure 11) as state more than second decision content level data.

When not yet continuing more than second stipulated time, CPU 711 again turns back to and judges that from the output signal of touch sensor 723 are the process (S2010 of Figure 11) of connecting or disconnecting.

When continue for more than second stipulated time, CPU 711 judges that pressure transducer 722 breaks down (S2040 of Figure 11), and the troubleshooting put rules into practice (S2050 of Figure 11).

As mentioned above, in the second fault verification process, when the output signal from touch sensor 723 be connect and to detect when level data continue for more than first stipulated time lower than the state of the first decision content level data or when the output signal from touch sensor 723 be off and detect level data be the state of more than the second decision content level data continue for more than second stipulated time time, judgement pressure transducer 722 breaks down.

Thus, even if as illustrated in Figure 10, slide block 720 abut timing that the timing of plunger 762 or slide block 720 separate from plunger 762 inconsistent with the timing of touch sensor 723 on-off, also can carry out the fault detect of pressure transducer 722 exactly.

And, be not limited to slide block release-push 780, slide block arranges switch 781 also can the fault of detected pressures sensor 722 by the such particular case of operation.

Above-mentioned first stipulated time, the second stipulated time can be set in suitable value by prior experiment etc.

It should be noted that, in above-mentioned Fisrt fault check processing and the second fault detect process, CPU 711 adopt the output signal (on-off) from touch sensor 723 to judge whether slide block 720 contacts with plunger 762, but also can be the mode of the output signal do not adopted from touch sensor 723.

Such as, CPU 711 also can judge that when slide block 720 is in beginning position, position slide block 720 does not contact with plunger 762.And, CPU 711 also from have input the connection signal of slide block release-push 780 and slide block 720 starts to have passed through to the opposite direction pushing direction moves and waits by experiment in advance and the time point of stipulated time of trying to achieve, can judge that slide block 720 does not contact with plunger 762.

And, CPU 711 also can from have input slide block the connection signal of switch 781 is set and slide block 720 start to push direction move have passed through and wait by experiment in advance and the time point of stipulated time of trying to achieve, judge that slide block 720 contacts with plunger 762.

Other embodiment of < >

Further, as described below, also can adopt the fluid ejection apparatus 1 that the slide block 720 with multiple pressure transducer 722 realizes according to the present embodiment.

Slide block 720 shown in Figure 12 has pie graph during the first pressure transducer (the first pressure detecting portion) 722a and the second pressure transducer (the second pressure detecting portion) 722b.

As shown in figure 12, slide block 720 is according to the present embodiment configured to the first pressure transducer 722a and the second pressure transducer 722b and pushes stacked on direction being configured at slide block 720.

And, the first pressure transducer 722a and the second pressure transducer 722b be arranged on when slide block 720 pushes fluid containment portion 765 by slide block 720 and plunger 762 the position that clamps.

Therefore, pressure when slide block 720 pushes fluid containment portion 765 is detected by the first pressure transducer 722a and the second pressure transducer 722b, export the first detection signal from the first pressure transducer 722a, export the second detection signal from the second pressure transducer 722b.

So when the first detection signal and the second detection signal are transfused to a/d converter 713, a/d converter 713 exports each self-corresponding first detection level data and second with it and detects level data.

CPU 711 uses the first detection level data and second to detect arbitrary data in level data or both carry out the control of above-mentioned various fluid pressing portion 731.Such as, CPU 711 uses the first detection level data and second to detect arbitrary data in level data or both move to make slide block 720, and pressure when making slide block 720 push fluid containment portion 765 becomes the target pressure value of regulation.

It should be noted that, when CPU 711 uses the first detection level data and second detects both level datas, still calculating their meansigma methods for controlling as well.According to this mode, even if to be mixed in the first detection signal and the second detection signal either party and the value making to be mixed into the detection level data of noise side sharply changes under such circumstances at such as noise, also can to continue convection cell pressing portion 731 and carry out stable control.

And, by above-mentioned Fisrt fault check processing or the second fault detect process, CPU 711 is when judging that the first pressure transducer 722a breaks down, use in the second pressure transducer 722b continuation and control, when judgement second pressure transducer 722b breaks down, the first pressure transducer 722a is used to continue above-mentioned control.

In this way, even if pressure transducer 722 there occurs fault, fluid ejection apparatus 1 also can carry out the control continuing the injection of fluid from pulsation generating unit 100, thus can improve the reliability of fluid ejection apparatus 1.

Further, in this case, fluid ejection apparatus 1 both can export can not output content be also the alarm that pressure transducer 722 breaks down.In the former case, although fluid ejection apparatus 1 can use normal pressure transducer 722 to proceed to control, also promptly the situation that another pressure transducer 722 breaks down can be informed to operator.

In the latter case, even if a pressure transducer 722 there occurs fault, fluid ejection apparatus 1 does not notify the situation that there occurs fault yet, thus the operation implementer performed an operation to concentrating one's energy can be avoided to cause stimulation.It should be noted that, in this case, the situation that also a pressure transducer 722 can be there occurs fault is such as kept in memorizer 712 as log information.In this way, when carrying out the maintenance of fluid ejection apparatus 1 after having performed the operation, the situation that pressure transducer 722 breaks down can be informed to maintenance man.

Or, such as, when fluid ejection apparatus 1 according to the present embodiment can be also more than the decision content specified in the difference that the first detection level data and second detects level data, at least one judging in the first pressure transducer 722a and the second pressure transducer 722b there occurs fault, and carries out exporting the above-mentioned troubleshootings such as the alarm of regulation.

According to this mode, except coming except the fault of detected pressures sensor 722 by above-mentioned Fisrt fault check processing, the second fault detect process, even if when not carrying out above-mentioned Fisrt fault check processing, the second fault detect process, also can the fault of detected pressures sensor 722.

Above, fluid ejection apparatus 1 involved by above-mentioned embodiment has been described in detail, fluid ejection apparatus 1 involved by these embodiments, can realize can fault, the safer and fluid ejection apparatus 1 that reliability is higher of detected pressures sensor 722.

In addition, above-mentioned embodiment is intended to promote the understanding of the present invention, explains the present invention with being not intended to limit.The present invention can carry out changing, improveing under the prerequisite not departing from its aim, the present invention includes its equivalent simultaneously.

Claims (6)

1. a fluid ejection apparatus, is characterized in that, possesses:

Fluid container, has the fluid containment portion of containing fluid and is formed at the fluid issuing in described fluid containment portion;

Fluid pressing portion, pushes described fluid containment portion, and described fluid is flowed out from described fluid issuing;

Connecting pipings, one end is connected with described fluid issuing;

Fluid jet portion, has the fluid taking mouth be connected with the other end of described connecting pipings, and the described fluid be taken into from described fluid taking mouth is sprayed with pulse type;

Passage opening/closing portion, opens or closes the stream of the described fluid in described connecting pipings;

Pressure detecting portion, detects pressure when described fluid pressing portion pushes described fluid containment portion, and exports the detection signal of the level corresponding with described pressure; And

Control part, under the state making described passage opening/closing portion close described stream, make described fluid pressing portion push described fluid containment portion, and described pressure when described fluid pressing portion contacts with described fluid containment portion represented by described detection signal lower than when the first decision content or, described pressure when described fluid pressing portion does not contact with described fluid containment portion represented by described detection signal be more than second decision content, judge that described pressure detecting portion breaks down.

2. fluid ejection apparatus according to claim 1, is characterized in that,

Described fluid pressing portion possesses:

Moving body, the press direction in described fluid containment portion moves, to carry out the pushing to described fluid containment portion; And

Position detection part, detects the position of described moving body,

Described first decision content is the described pressure represented by described detection signal and the value determined that export from described pressure detecting portion when being in based on described moving body the assigned position do not contacted with described fluid containment portion.

3. fluid ejection apparatus according to claim 2, is characterized in that,

Described first decision content is the value that setting that the described pressure represented by described detection signal that described moving body exports from described pressure detecting portion when being in described assigned position is determined with the error according to described pressure is added gained.

4. the fluid ejection apparatus according to Claims 2 or 3, is characterized in that, described fluid ejection apparatus also possesses:

Pressure detecting portion described in pressure detecting portion described in first and second,

Pressure detecting portion described in pressure detecting portion described in first and second be configured in the described press direction of described moving body stackedly when described moving body pushes described fluid containment portion by described moving body and described fluid containment portion the position that clamps,

Described control part adopt from pressure detecting portion described in first export first described in detection signal and from pressure detecting portion described in second export second described in any one detection signal detection signal or two detection signals control the described movement of described moving body, described pressure when making described moving body push described fluid containment portion is the target pressure value of regulation

When described in judgement first, pressure detecting portion breaks down, described control part adopts detection signal described in second to continue described control,

When described in judgement second, pressure detecting portion breaks down, described control part adopts detection signal described in first to continue described control.

5. fluid ejection apparatus according to any one of claim 1 to 4, is characterized in that,

When judging that described pressure detecting portion breaks down, described control part makes described passage opening/closing portion open described stream.

6. fluid ejection apparatus according to any one of claim 1 to 5, is characterized in that,

When judging that described pressure detecting portion breaks down, described control part exports the alarm representing that described pressure detecting portion breaks down.